Drop eol php 7 (web-push-libs#361)

* Drop eol php 7.3 7.4

* Add php 8.2 to Github tests

* test with disabled `gmp` extension

* Add extension suggestion to composer

* Remove outdated php 7.x code

Update README.md

More precise typing on PHP 8.1 (web-push-libs#340)

* Add #[\ReturnTypeWillChange] attribute for PHP 8.1 compatibility.

* Update tab to space.

* A different approach that works across all version.

Add #[\ReturnTypeWillChange] attribute for PHP 8.x compatibility. (we…

…b-push-libs#339)

* Add #[\ReturnTypeWillChange] attribute for PHP 8.1 compatibility.

* Update tab to space.

Handling ConnectException (web-push-libs#299)

* Handling ConnectException

* Syntax changes

Co-authored-by: Louis Lagrange <lagrange.louis@gmail.com>

Use protected properties and methods in WebPush class (web-push-libs#324

)

This allows other projects to extend the WebPush class and alter the way
it works. An example use-case is to replace Guzzle with a ReactPHP based
HTTP client for better integration in long-running asynchronous
processes.

Fixes the signed bytes conversion (web-push-libs#304)

Fix undefined method Brick\Math\BigInteger::getX() (web-push-libs#297)

* Fix web-push-libs#292

* Fix inconsistent local key generation

* Fix GMP support of key creation

* Fix duplicated import and hex size

* Fix duplicated import and hex size

* Typo…

* Fix invalid hex value length

* Fix invalid hex value length

* self:: call removed

* Ignore irrelevant PHPStan error

Support Guzzle 7 (web-push-libs#294)

* Support Guzzle 7

Upgrade Guzzle version (needed for usage in Laravel 8)

* Update composer.json

Skip unit tests temporarily (web-push-libs#285)